(AGI) Rome, July 20 - Beyonce published a 15-second trailer ofFifty Shades of Grey on Instagram on Saturday, causing averitable flurry of comments, with over 288,000 people writingon her page in just a few hours. The most popular theories onthe web are that the singer has a role in the film, which starsDakota Johnson, or that she will be featured on the soundtrack.The film is based on the immensely popular trilogy that floodedbookstores a few years ago. The 15-second teaser contained aremix of the Beyonce hit Crazy in Love and breached the secrecysurrounding the film so far. (AGI) . .